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Note 2 - Oil and Gas Leases - Oil and Gas Leasing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Gross revenues
Royalty interests	$ 588,121	$ 488,947
Lease fees	21,001	21,909
Gross Revenue	609,122	510,856
Production costs	62,315	47,212
Results before income tax expense	546,807	463,644
Estimated income tax expense	169,510	97,365
Results of operations from producing activities excluding corporate overhead	$ 377,297	$ 366,279

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- Definition

Gross revenues abstract.

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- Definition

The amount of revenue relating to lease fees.

+ References

No definition available.

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- Definition

The amount of expenses related to oil and gas producing activities.

+ References

No definition available.

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- Definition

Income before income taxes for oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

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Income tax expense for oil and gas producing activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62259-109447

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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62299-109447

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Total revenues from oil and gas producing activities.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 23
-Subparagraph (a)
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Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-03.1(e))
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